Abstract

We report on nonlinear microscopic imaging of detectors under two-photon excitation. Such nonlinear detectors have recently received much attention for their application in femtosecond laser pulse diagnostics. A laser scanning microscope illuminated by a fs Ti:sapphire laser was used to image a ZnSe photodetector and a light emitting diode (LED) as a detector. The ZnSe detector, fabricated with an interdigitated finger structure had Ag/Ti metalization contacts and was operated in the photoconductive mode. The surface-emitting InAlGaP high-brightness LED was operated in the photovoltaic mode.

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